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---
title: WeakSet.prototype.clear()
slug: Web/JavaScript/Reference/Global_Objects/WeakSet/clear
tags:
- JavaScript
- Method
- WeakSet
- 废弃
translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/clear
---
<div>{{JSRef}} {{obsolete_header}}</div>
<p><code><strong>clear()</strong></code> 方法用于删除 <code>WeakSet</code> 对象的所有元素，但是已经不是 ECMAScript 的一部分了。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><em>ws</em>.clear();</pre>
<h2 id="示例">示例</h2>
<h3 id="使用_clear方法">使用 <code>clear方法</code></h3>
<pre class="brush: js example-bad">var ws = new WeakSet();
ws.add(window);
ws.has(window); // true
ws.clear();
ws.has(window); // false
</pre>
<h2 id="规范">规范</h2>
<p>没有规范或草案。该方法原本计划包括在 ECMAScript 6，但是在草案 revision 28 (October 14, 2014) 被抛弃了。浏览器原先的实现不久后也被移除了，它从来不是标准的一分子。</p>
<h2 id="浏览器支持">浏览器支持</h2>
<p>{{CompatibilityTable}}</p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>36</td>
<td>{{CompatNo}} [1]</td>
<td>{{CompatNo}}</td>
<td>23</td>
<td>{{CompatNo}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}} [1]</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
</tr>
</tbody>
</table>
</div>
<p>[1] Added to Firefox in version 34, but removed in version 46. See {{bug(1101817)}}.</p>
<h2 id="相关">相关</h2>
<ul>
<li>{{jsxref("WeakSet")}}</li>
<li>{{jsxref("WeakSet.prototype.delete()")}}</li>
</ul>
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